explain select i_item_desc ,i_category ,i_class ,i_current_price ,i_item_id ,sum(cs_ext_sales_price) as itemrevenue ,sum(cs_ext_sales_price)*100/sum(sum(cs_ext_sales_price)) over (partition by i_class) as revenueratio from catalog_sales ,item ,date_dim where catalog_sales.cs_item_sk = item.i_item_sk and i_category in ('Jewelry', 'Sports', 'Books') and catalog_sales.cs_sold_date_sk = date_dim.d_date_sk and d_date between '2001-01-12' and '2001-02-11' group by i_item_id ,i_item_desc ,i_category ,i_class ,i_current_price order by i_category ,i_class ,i_item_id ,i_item_desc ,revenueratio limit 100;
